Log file is not showing milliseconds of a timestamp

Question

I have the following log to a text file method: I wanted to include a time stamp like this (2014-01-23 09:42:20.020 AM) but when I look at my log file it doesn't include the .020 time. Did I miss to format something? ``` // Build timestamp string var currentDateTime = DateTime.Now; string timeStampString = currentDateTime.ToString("ddMMyyyy_HHmmssms"); // Build filename messages, concat timestamp and .txt extension. string debugFileName = "C:\Test" + timeStampString + ".txt"; var inboundMessageLog = new StreamWriter(debugFileName, false, System.Text.Encoding.Default); // Write to the file: inboundMessageLog.WriteLine(DateTime.Now); inboundMessageLog.WriteLine("TimeStampString = {0}", timeStampString); inboundMessageLog.WriteLine("Inbound message = {0}", strMessage); inboundMessageLog.Close(); // ------------------------------------------------------------------------------------------- ``` } Thank you for your time. UPDATE: This format: ``` string timeStampString = currentDateTime.To…

Accepted Answer

Problem : You are using `ms` to represent the Milliseconds.

Solution : there is no custom format `ms` You need to use `fff` to represent `MilliSeconds`

fff The milliseconds in a date and time value.

if you want to get the Date and Time in the format of `(2014-01-23 09:42:20.020 AM)`

You need to use this format `yyyy-MM-dd hh:mm:ss.fff tt`

Try This:

```
string timeStampString = currentDateTime.ToString("yyyy-MM-dd hh:mm:ss.fff tt");
```

EDIT : if you want custome format as `dd-MM-yyyy_HH:mm:ss:fff`

Try This:

```
string timeStampString = currentDateTime.ToString("dd-MM-yyyy_HH:mm:ss:fff tt");
```

Explanation:

`yyyy` - Year in 4 digits `MM` - Month in two digits `dd` - Date in two digits

`hh` - Hours in two digits. `mm` - Minutes in two digits. `ss` - Seconds in two digits.

`fff` - Milliseconds `tt` - AM or PM.

See this for more information : DateTime custom formats